LG TracFone LG840G Service Manual page 52

C158
L102
100p
15n
C103
4.7p
L104
DNI
C157
100p
SW102
VREG_MSMP_2.6V
ANT_SEL[2]
ANT_SEL[1]
ANT_SEL[0]
GSM850/EGSM TX
LGE Internal Use Only
TP2
GND
C105
L107
TP3
100n
C107 C108
1u 33p
TP1
R101 1K
R102 1K
R103 1K
ANTENNA SWITCH MODULE LOGIC
ANT_SEL0
DCS/PCS TX
WB850
WB 1900
GSM850 RX
EGSM RX
DCS RX
PCS RX
33p
12
ANT
13
L108
GND4
14
VDD
15
15n
VC3
16
VC2 GSM1800/1900RX2
17
VC1 GSM1800/1900RX1
ANT_SEL1
1 1
1 0
1 0
0 1
1 0
0 0
1 1
0 0
- 52 - Copyright © 2012 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
WCDMA_1900
WCDMA_850
FL101
5
GSM850RX1
4
GSM900RX2
3
GSM900RX1
2
1
LMSP33QJ-C65TEMP
EAT61533501
ANT_SEL2
0
0
1
1
1
1
1
1
Only for training and service purposes